Method for preparing potassium chloride by using mixed potassic salt ores

Abstract

The invention provides a method for preparing potassium chloride by using mixed potassic salt ores. The method comprises the following step: firstly crushing the mixed potassic salt ores; then adding the mixed potassic salt ores into a decomposition crystallizer; adding fresh water and circulating saturated E-point liquid into the decomposition crystallizer at the same time, wherein the adding amount of the fresh water is 105%-120% of a theoretical calculating value and the adding amount of the circulating saturated liquid is 2.5-8 times as much as that the adding amount of raw ores; infiltrating a bottom flow of the decomposition crystallizer into grading work to be graded; carrying out ore grinding on a rough grain part and then carrying out flotation; directly carrying out the flotation on a fine grain part; in the flotation process, using the two parts to independently carry out the flotation; carrying out the flotation to obtain concentrate ores, and filtering, washing, dehydrating and drying to obtain a potassium chloride product. The product is good in quality, rough in granularity and relative low in processing cost; the adaptability to the raw ores is very strong; the potassium chloride product produced by the method can be used as an industrial product and can also be used as a farm-oriented potassium fertilizer, so that the application range of the product is widened; the potassium chloride product is rough in granularity and is easy to filter, centrifuge and dehydrate; when the potassium chloride product is dried, the energy consumption is low, so that the production cost of enterprises is reduced.

Description

technical field [0001] The invention relates to a preparation process of potassium chloride, and is particularly suitable for the method for preparing high-quality potassium chloride from mixed ore of potassium halite and carnallite. Background technique [0002] The methods for producing potassium chloride from mixed ore are generally divided into positive flotation method and hot solution crystallization method. However, the positive flotation method used before is generally: mixed ore → grinding (add fresh water and saturated brine during the grinding process, and decompose while grinding) → flotation. After the mixed ore is ground and decomposed, it directly enters the flotation operation. The flotation generally adopts primary roughing, primary sweeping, and secondary beneficiation. The secondary beneficiation concentrate is washed→dehydrated→dried to obtain potassium chloride product. The potassium chloride product obtained by this process has a fine particle size and...

AI Technical Summary

Problems solved by technology

The potassium chloride product obtained by this process has a fine particle size and poor dehydration performance. At the same time, due to the fine particle size of the potassium chloride product, the energy consumption is high during drying, which increases the production cost of the enterprise; in addition, the product is easy to agglomerate, which brings inconvenience to use.

In addition, the original positive flotation process is full-stage grinding, and the grinding cost is also high

Another method of producing potassium chloride from mixed ore is the hot solution crystallization method. This method has high energy consumption and serious equipment corrosion. Due to the high energy consumption, the production cost per ton of potassium chloride is high, which is unbearable for enterprises.